Noise modulation for open access and remotely positioned mri

Details Noise modulation for open access and remotely positioned mri Noise modulation for open access and remotely positioned mri

G - Physics

01

R

G01R 33/48 (2006.01) G01R 33/50 (2006.01) G01R 33/565 (2006.01)

Patent

CA 2240868

A method for creating an image of in situ biological tissue uses an inhomogeneous field MRI device to pulse the tissue with sequential epochs of excitation pulses. Each epoch of excitation pulses includes, in order, an initial tilting pulse, an x-y encode and a train of refocussing pulses. Specifically, each x-y encode has a K-space identifier of the form i(1..m) + j(1..n), and the tilting pulses change sign according to whether the K-space identifier (i+j) is odd or even. For an image having mxn pixels, nxn epochs are used to generate nxn measurements of imageable spin echo signals. These mxn measurements are then collated to create the image.

L'invention est une méthode de production d'images d'un tissu biologique in situ qui utilise un dispositif à résonnance magnétique à champ non homogène pour transmettre au tissu des intervalles séquentiels d'impulsions d'excitation. Chacun de ces intervalles comprend dans l'ordre une impulsion d'inclinaison initiale, une impulsion de codage x-y et un train d'impulsions de refocalisation. Spécifiquement, chaque impulsion de codage x-y comprend un identificateur d'espace K de la forme i(1..m) + j(1..n) et les impulsions d'inclinaison changent de signe selon que l'identificateur d'espace K (i + j) est impair ou pair. Dans le cas d'une image de m X n pixels, n X n intervalles sont utilisés pour produire n X n mesures de signaux d'écho de spin imageables. Ces m X n mesures sont alors compilées pour créer l'image.

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